D29783: [kcm/kwinrules] Fix placeholder message in RulesEditor

[Nathaniel Graham]

ngraham accepted this revision.

REPOSITORY
  R108 KWin

BRANCH
  fix/placeholder

REVISION DETAIL
  https://phabricator.kde.org/D29783

To: iasensio, ngraham, broulik, #vdg, #plasma
Cc: kwin, Orage, cacarry, LeGast00n, The-Feren-OS-Dev, cblack, jraleigh, zachus, fbampaloukas, mkulinski, ragreen, jackyalcine, iodelay, crozbo, bwowk, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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